• Journal of Korean Physical Therapy Science
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• v.5 no.3
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• pp.675-689
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• 1998

The purpose of this study was to determine the efficient way of stretching technique from three methods, and of stretching duration and frequency. Sretching is known to improve musculotendinous flexibility and joint suppleness, and employed in many warm-up routines during physical activities and athletic performances. The benefits and the rationale of stretching have been reviewed. Many authors agree that, for the best results, static stretching has to be held for approximately 30 sec. in a trial, three trials in a session, at least three times a week for four weeks. Further clinical studies are required for elucidating more informations on this subject.

• Korean Journal of Childcare and Education
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• v.11 no.5
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• pp.135-151
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• 2015

The purpose of this study was to investigate the relationship between preschoolers' motor proficiency and their executive function. Participants were 72 children who participated in individual tests. Motor proficiency was measured by a shortened form of the Bruininks-Oseretsky Test of Motor Proficiency Second Edition(BOT-2). Executive functions were assessed by utilizing the revised version of the four tasks: 'Day-Night Task', 'Dimensional Change Card Sort Task', 'Lift Flag Task' and 'Digit Span Task'. The major findings were as follows. First, the 5-year-olds motor proficiency was found to be better than the 4-year-olds. Second, the 5-year-olds executive function was found to be better than the 4-yeat-olds. Last, the 4-year-olds' and 5-year-olds' motor proficiency was related to their executive function. Concretely, fine manual control of motor proficiency was executive function and there was a high correlation. And behavior response inhibition and working memory of executive function was motor proficiency and there was a high correlation. Data analysis showed that preschoolers' motor proficiency and their executive function were different by their age level and that preschoolers' motor proficiency was correlated with their executive function.

• Journal of Korea Entertainment Industry Association
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• v.13 no.7
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• pp.361-373
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• 2019

Falls are a threat to the physical health of the elderly as well as to their overall quality of life. The purpose of this study was to identify which type of exercise is effective for improving the balance of the elderly, and to obtain the basic data for developing the falls prevention exercise intervention program for the elderly. We compared to the differential effects between rhythmic step exercise and core muscle strengthening exercise in terms of functional balance test and self-reported balance test. Women older than 65 years and under 80 years of age were assigned to one of the step exercise group(21), core muscle exercise group(20), and control group(21), and for 8 weeks, twice per week, 20-30 minutes of exercise were treated. All participants performed one foot static balance test with open and closed eyes. And they responded to self-reported balance test, such as Fall Efficacy Scale(FES) and Activities-specific Balance Confidence(ABC) Scale. The results of statistical analysis are summarized as follows. First, rhythmic stepping exercise was more effective in improving functional balance than core muscle strengthening exercise. In particular, the effect of step exercise was obvious in the one-foot static balance test with open eyes. Second, the self-reported balance test showed better step exercise than core muscle exercise. Specifically, rhythmic step exercise was more effective in enhancing fall efficacy than core muscle exercise. In conclusion, the rhythmic step exercise was more effective in improving the balance ability of the elderly than the core muscle exercise. The rhythmic step exercise is more related to the lower extremity muscles, and especially since the rhythmic step exercise is performed in various ground changes, it seems to have a high similarity to the fall occurrence situation. For future research, we recommended the development of task-oriented ankle proprioceptive exercise intervention program and exercise equipment based on the specific motion situation in which the fall accident occurs in the elderly.

• The Journal of the Korea Contents Association
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• v.14 no.9
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• pp.120-130
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• 2014

The purpose of this study was to evaluate the effects of line dance activity on the balance factors during static standing to reveal the exercise intervention for fall prevention. A 15-week line dance programme was applied to 16 elderly females who aged more than 65 years in the community. Balance ability during static standing was evaluated by the range of center of pressure(cop), the velocity of cop, and sway area that calculated on the basis of ground reaction force data, forces, and moments. The range and velocity of cop in the anterio-posterior were significantly reduced after line dance(p<.01, p<.05, respectively), but change in those of cop in the medio-lateral was not found. It was demonstrated that 16-week line dance activities allow more effective in anterio-posterior stability and sway area of static standing. It was suggested that the effect of fall prevention exercise should be studied more associate with fall from vestibular and sensory system as future study.

• Journal of the Korea Convergence Society
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• v.8 no.1
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• pp.231-238
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• 2017

The purpose of this study was to investigate effects of changes in body composition due to combined exercise on balance of the 20' obese women. Based on voluntary participation, 21 obese women in twenties were randomly divided into : Control(no exercise, n=7), Group I (aerobic exercise 50 minutes, n=7), Group 2 (combined exercise 50 minutes, n=7). All groups conducted allocated program five times a week for six weeks. At post and pre-experiment and at the time of each measurement, changes of body composition and balance among the three groups were statistically analyed using SPSS 18.0 ver. Compared to pre-experiment, Group I, II showed decrease of weight and body fat rate, but Group II showed both increase of muscle mass and decrease of body mass index(p<0.05). In balance ability, Group II showed improvement of static and dynamic balance, meanwhile Group I showed only improvement of static balance. Therefore, this research showed that combined exercise had positive effects on balance by increasing muscle mass and changing body composition.

• 재활복지
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• v.20 no.1
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• pp.189-210
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• 2016

The purpose of this study was to investigate the relationships between cognitive function and self efficacy, health behavior of the elderly participation to physical activity. Data were collected from November 2015 to January 2016. The study subjects were 61, aged 65 years or older, to visit health town. The questionnaire was composed general characteristics and K-MoCA, self-efficacy scale, self-efficacy for exercise tools, Korea's elderly health behavior. The results of the study were as follows: As for cognitive function and exercise self-efficacy by general characteristics, there were differences in that regard according to gender, education, marital status, dependents form, duration of the program(p <.05), the general self-efficacy showed differences in gender, age, education, economic status, duration of the program(p <.05), and the health behavior showed differences in gender, education, marital status, dependents form, activity program, duration of the program(p <.05). There was a significant correlation between cognitive function and exercise self-efficacy, health behavior(p <.01). General self-efficacy was correlated with exercise self-efficacy, health behavior. And exercise self-efficacy was correlated with health behavior(p <.01). Exercise self-efficacy were the factor affecting the cognitive function(p <.01). Therefore, the activity program development for the practice and sustainable participation in physical activity in the elderly is believed to be made.

• The Journal of the Korea Contents Association
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• v.10 no.12
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• pp.397-405
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• 2010

The purpose of this study was to investigate the effect on self-management and sports coping of student athletes. The data was collected from 446 student athletes in Seoul and Incheon who were registered in Korean Olympic Committee before they participated the 2010 National Athletic Meet. Athlete Self-Management Questionnaires and Athlete's Sports Coping Scale Questionnaires as The investigation tools were used for the data collection. The data, which was collected by using SPSS 17.0, was analysed with t-test, factor analysis and multi-regression. The results of this study were as follows. First, there was a difference of the class over self-management and sports coping. Second, a difference in sports career existed between self-management and sports coping. Third, self-management affected sports coping of student athletes.

• Korean Journal of Cognitive Science
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• v.15 no.3
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• pp.15-24
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• 2004

The perceived position of a flashing target object is generally biased towards the direction of eye movement when there is no reference around the target. Current research examined the localization accuracy of a flashing target relative to a static reference. The perceived location of the target relative to the reference was distorted and the pattern of perceptual distortion systematically depended on the position of the reference relative to the target. This kind of result was consistently observed regardless of the distance between the reference and the target and direction of pursuit eye movement. We have discussed how these results could he explained by the theories previously suggested to explain the localization of objects.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.11
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• pp.948-956
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• 2012

This paper presents the computations of the longitudinal and directional stability derivatives for the SDM(Standard Dynamic Model). The static and dynamic derivatives are evaluated at once using forced harmonic oscillations in the pitch and yaw directions. For the numerical simulations, a 3-D Euler solver that uses a dual time stepping method for unsteady time accurate simulations is applied. This work investigates the variation of the derivatives in terms of the Mach number and the several motion parameters. Good agreement of the pitch and yaw stability derivatives with previously published numerical results and experimental results are observed.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.05a
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• pp.469-471
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• 2010

Supercavitating vehicles which cruise under water undergo high longitudinal force caused by thrust and drag. These combination may cause structural buckling. Static and dynamic buckling analysis method by using FEM can be used to predict this structural failure behavior. In this paper, some principles which include method for solution eigenvalue problem for buckling analysis are introduced. And before buckling analysis, we predicted some mode shape and natural frequency of cylindrical shell by using DIAMOND/IPSAP eigen-solver.